LTPS Array Substrate Edge Transmittance via Segmented Common Electrode
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Solution Overview
Problem
Existing LTPS array substrates for liquid crystal display panels experience significantly lower transmittance at the edge positions of adjacent sub-pixels, which deteriorates the display effect.
Innovation Solution
An LTPS array substrate is designed with a second common electrode layer formed on the same horizontal plane as the pixel electrode layer, electrically connected through a via hole to the first common electrode layer, enhancing the electric field intensity and transmittance at the edge regions by eliminating the need for additional material layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional single common electrode layer is used, then the device structure is simple, but the transmittance at edge positions of adjacent sub-pixels is significantly lower
Solution Approach 1:
The common electrode is segmented into two separate layers: a first common electrode layer and a second common electrode layer. The second common electrode layer is positioned between pixel electrodes of adjacent sub-pixels and electrically connected to the first common electrode layer through a via hole. This segmentation allows the common electrode to provide enhanced electric field intensity at edge positions without significantly increasing manufacturing complexity, thereby improving transmittance at these critical locations.
2Illumination intensity
If additional material layers are added to improve edge transmittance, then the transmittance performance improves, but the device complexity and number of layers increase
Solution Approach 1:
The second common electrode layer is merged with the pixel electrode layer structure by positioning it on the same horizontal plane. This merging approach allows the common electrode to enhance edge transmittance while sharing the same structural plane as the pixel electrodes, thereby avoiding significant increases in the total number of material layers and maintaining device simplicity.
Solution Approach 2:
Instead of adding more layers in the vertical dimension, the invention utilizes the horizontal plane dimension by positioning the second common electrode layer between pixel electrodes of adjacent sub-pixels. This dimensional approach allows enhanced edge transmittance without proportionally increasing the number of material layers, as the second common electrode layer shares the same horizontal plane as the pixel electrode layer.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The enhanced electric field intensity and shared layer configuration improve transmittance at the edge regions of adjacent sub-pixels, increasing overall transmittance without increasing the number of material layers.
Implementation Method 1
the second common electrode layer, which is formed on the passivation layer, located between pixel electrodes corresponding to two adjacent sub-pixels in the pixel electrode layer, electrically isolated from the pixel electrode layer, and electrically connected to the first common electrode layer through the first via hole
Data Source
AI summary
Provided is an LTPS array substrate and a liquid crystal display panel, wherein the LTPS array substrate comprises: a first common electrode layer; a passivation layer, which is formed on the first common electrode layer, and has a first via hole formed therein; a pixel electrode layer, which is formed on the passivation layer; and a second common electrode layer, which is formed on the passivation layer, located between pixel electrodes corresponding to two adjacent sub-pixels in the pixel electrode layer, electrically isolated from the pixel electrode layer, and electrically connected to the first common electrode layer through the first via hole. The array substrate is capable of significantly enhancing the intensity of an electric field at an edge region of the adjacent sub-pixels, thereby increasing the transmittance at this region.